#version 460 core
#extension GL_NV_ray_tracing : enable
#extension GL_GOOGLE_include_directive : enable
#include "raycommon.glsl"

layout(location = 0) callableDataInNV rayLight cLight;

layout(push_constant) uniform Constants
{
  vec4  clearColor;
  vec3  lightPosition;
  float lightIntensity;
  vec3  lightDirection;
  float lightSpotCutoff;
  float lightSpotOuterCutoff;
  int   lightType;
};

void main()
{
  vec3 lDir               = lightPosition - cLight.inHitPosition;
  cLight.outLightDistance = length(lDir);
  cLight.outIntensity     = lightIntensity / (cLight.outLightDistance * cLight.outLightDistance);
  cLight.outLightDir      = normalize(lDir);
  float theta             = dot(cLight.outLightDir, normalize(-lightDirection));
  float epsilon           = lightSpotCutoff - lightSpotOuterCutoff;
  float spotIntensity     = clamp((theta - lightSpotOuterCutoff) / epsilon, 0.0, 1.0);
  cLight.outIntensity *= spotIntensity;
}